2 versions of camtasia... 2019 and 2020. Can I delete 2019 so I only have one version. I think it would be okay as I did the same with snagit.
You can but I would not.... my rule is to always keep the newest version and the next newest version working "just in case". You never know when some change it the updated version can cause you pain... being able to fall back if you need to is very comforting... not everyone will agree with this approach but it has worked well for me